1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 5l5 



Constriction on the side, behind the peristome ; last whorls smooth. 



DiPLOMMATINA KHTJNHOENSIS, n. Sp. 



Loc. Khunho Peak and Trigonometrical Station, 8809 ft. above 

 the Mao villages, Naga Hills (m coll. H. H. G.-A.). 



Shell dextral, ovately fusiform, not rimate ; sculpture, fine regular 

 costulation onthe3rd,4th, and 5th whorls, the 2 apical smooth, the last 

 whorls polished and glassy ; colour pale sienna ; spire, side flattened 

 near the apex, which is somewhat acuminate ; suture impressed ; 

 whorls 8, the antepenultimate the largest ; constriction behind the 

 aperture on the penultimate whorl ; aperture oval and vertical ; 

 peristome double, strong, continuous; columellar tooth well developed, 

 rather remote. 



Size: maj. diam. 2*2 ; alt. axis 4*8 to 5*2 millim. 



Six specimens were found. 



A form rather longer and less swollen occurs in the same range; 

 about 30 specimens were obtained at Gnameh Peak (5585 feet), near 

 the Barak River. 



There is another form much smaller, being only 3*5 in length, 

 with the same glassy last whorls and the constriction rather further 

 back, behind the aperture. Examples of this were also found at 

 Sikhamih, in the Lahupa Naga Hills. I distinguish this variety as 

 khunhooensis, var. minor. 



DiPLOMMATINA LAPILLUS, n. Sp. 



Loc. Kopamedza Peak, Lahupa Naga Hills, 8375 it.{Godw,-Aust.). 



Shell dextral, elongately fusiform, tumid below, not rimate; 

 sculpture fine, regular, close costulation, which is often much worn 

 down ; colour (bleached) ; spire with sides flattened, apex acuminate ; 

 suture shallow ; whorls 8, sides flatly convex, the antepenultimate 

 the largest ; constriction of the penultimate whorl on the side, 

 well behind the aperture ; aperture oval, subvertical ; peristome 

 thickened, double, rounded below ; columellar tooth small and far 

 back within the aperture. 



Size: maj. diam. 3*0 ; alt. axis 6"0 millim. 



Three specimens, marked from the "north of the Burrail Range." 

 Two are from the typical locality given above. 



DiPLOMMATINA COMPACTA, n. Sp. 



Loc. South of Barak in Munipur {Godwin- Austen). 



Shell dextral, small, tumidly fusiform ; sculpture, the two apical 

 whorls smooth, two next with fine close ribbing, the last three 

 whorls smooth or glassy ; colour pale ochraceous white ; spire, sides 

 rather flat, apex moderately blunt ; suture slightly impressed ; 

 whorls 7|-, the antepenultimate the largest and tumid ; constriction on 

 the side, well behind the aperture, at about 1 millim. distant ; 

 aperture oval, vertical ; peristome double ; columellar tooth large 

 in front, and directed downwards. 



Size: maj. diam. 1*8; alt. axis 3*5 millim. 



